It’s official! The public-private Downtown Brooklyn Partnership beginning August 15 will seize control the Metro Tech Business Improvement District.

Mayor Bloomberg and the borough’s biggest developer, Forest City Ratner, looked to have easily prevailed in a heated Downtown Brooklyn turf war on May 10 when the BID’s board voted 21-9 (with Councilman Steve Levin, D-Brooklyn abstaining) in favor of awarding the Partnership a $216,667-a-year contract to run the BID’s daily operations.

But a faction challenging the takeover, including top BID brass, later contended it would prevail once the board’s votes were officially tallied using the BID’s “weighted” voting system. So it refused to honor the takeover until the results were final.

It took nearly three months for the BID’s accountant to calculate the numbers using a very complicated formula based on property holdings. The BID released the new results in a memo yesterday to membership. It said 69.5 percent of the weighted votes supported the takeover of the striving BID, which represents 25 square blocks in and around Metro Tech Center.

BID President Victoria Aviles, who opposed the takeover, said in the memo that the agreement with the Partnership would begin August 15 and that the last day of employment for Michael Weiss, the BID’s longtime executive director, would be August 31.

Weiss, who fought hard to keep his $165,000-a-year job, said he is no longer considering any legal challenges and that “it’s time to move on.”

“I think it’s about time to get on with the next phase of my life,” he said. “I enjoyed being here and feel we accomplished many good things.”

The Partnership, a development corporation created by Bloomberg to spur economic development in Downtown Brooklyn, will now manage the BID’s operations — and its $2.6 million yearly budget raised through a neighborhood property tax — ending more than two years of bickering by BID board members split over the plan.

A faction, including Aviles and top BID brass, had fought the Partnership plan despite pressure from City Hall and developer Forest City Ratner, which built Metro Tech’s office complex in the 1980s.

The Partnership is already paid $220,000 annually to run smaller, adjacent BIDs representing Fulton Mall and the Court-Livingston-Schermerhorn streets corridor.

Supporters of the Metro Tech takeover said it cuts wasteful government spending and claimed the public is better served if the three BIDs’ resources are merged into a single entity.

“We plan to look at ways to strengthen the three BIDs,” Partnership President Joe Chan told the Post in May. He cited potential partnerships between local universities and retail businesses as an example for boosting the local economy.

Under the agreement with the Partnership, Metro Tech BID will see its total number of representatives on the Partnership board rise from one to four.